Induction-motor.



Patented Iuly 9, mm.

No. 678,034. l

H. G. REIST.

INDUCTION MOTOR.

(Application led Nov. 28, 1898.)

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No. 678,034. Patented luly 9, |90l.

H. G. REIST.

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UNiTnD STATES .PATENT Orrrcn.

HENRY G. REIST, OF SCHE'NECTADYLNEVVA YORK, ASSIGNOR TO THE GENERALELECTRIC COMPANY, OF NEW YORK. Y

` INDUCTION-Moron.

SPECIFICATION forming part of Letters Patent No. 678,034, dated July 9,1901. Application iiledNovemlaer 28,1898. Serial No. 697,624. (Nomodel.)

tady, in the county of Schenectady, State ofl New York, have inventedcertain new and useful Improvements 'in Induction Motors, (Case No.662,) of which the following is a specification.

The present invention :relates to starting and controlling resistancesfor alternatingcurrent induction-motors and has reference particularlyto the means for supporting the same within-the revolving member of themotorand to the means for varying the amount of resistance in 'circuitwith the induced winding.

The invention consists more particularly in details of construction andis eXempliiied in'the mechanical arrangement illustrated in theaccompanying drawings, in which-Y Figure 1 is a sectional vview of amotor embodying my invention; Fig. 2, a view in end elevation. Fig. 3 isa View of the circuit connections of the induced member, and Fig. 4 is aplan view of the resistance-grid.

Referring to the drawings, B denotes the main supporting-frame'of aninduction-motor of well-known type and having bolted to one side thereofa clamping-plate B for securing in place the laminated structure-C,

forming the core of the inducing member of A portion of the primaryWindthe motor. ing is indicated at D. The side plates A are bolted tothe supporting-frame B and serve to protect the operating parts of themachine from injury. The particular construction of the primary memberis, however, immaterial so far as my present invention is concerned.

The revolving or induced member of the motor consists of the usuallaminated toothed structure E, supported by end rings G', which .rior ofthe inducing member by means of a special forln of supporting-frame,each frame 'and associated parts being located between two of the arms Iof the spider. This frame consists of a rectangular portion constructedwith cross-bars and interveningspaces, so as .to give lightness.Stiffening-ribs S are used to give rigidity. A cross-piece T arches overfrom one side to the other of the supportingframe and has a forked lug,through which fbolts H pass and by which one end of the frame is securedto the ring G. The opposite end of the supporting-frame is secured bybolts F to lugs formed integral with the ring G', as clearly shown inthe drawings. Depending from each supporting-frame are two arms K,connected together by a crossbar K', formed integral therewith andhaving extensions projecting therefrom parallel `with the main portion'of the supportingframe, as best shown at oi, Fig. l. The L- shapedsupport thus carried by the depending arms K serves to support thecontacts which are electrically connected to the resistancegrid I,carried by the main supporting-frame, as shown in Fig. l. Thisresistance-grid I (shown in detail in Fig. 4.) consists of a castinghaving the form of a strip bent back and forth on itself and forming aseries of parallel conductors connected in series from one end of thegrid to the other. The conductors are shortened at intervals to aordspacefor certain of the bolts I3, which serve to secure the grid to itssupportingframe. The two outside bolts at one side of the grid passthrough the lugs t6. These bolts are insulated from the grid, except atthe point C, Fig. l, at which is interposed a metallic washer, whichserves to electrically connect one end of the grid to itssupporting-frame. The other end of the grid is electrically connected atT to the lead l2., which makes con--` nection with the induced windingin a wellknown manner. Intermediate points z3 and 9 are connected byleadsz' i with the contacts 2, carried by the depending portion of thesupporting-frame and insulated therefrom by plates of insulatingmaterial 3. One extremity of the grid is connected through the lead I2with the contact-block I4,while the opposite end of the grid is put inconnection with the contact-blocl through the washer C, thesupporting-frame itself, and the bolts Z), which are in contactelectrically with said contact-blocks and screw into thesupporting-frame. Since, however, one end of each resistance-grid is inelectrical connection with the frame of the machine, as described, theblock @"5 serves less as a contact-block than as a guide for thecontact-brush operating in conjunction therewith and hereinafter to bedescribed.

The value of the starting resistance in circuit withthe induced memberis varied by electrically connecting together corresponding points ineach of the three resistances I. In Fig. 3 I have diagrammaticallyillustrated the circuit connections between the resistance-grids and thewinding of the induced member. A plurality of brushes Q, electricallyconnected to each other and movable over the contacts and I4, serve tocontrol the resistance connections. The brushes Q, are carried by a ringR, surrounding the shaft J and movable longitudinally thereon. The ringis prevented from rotating about the shaft by means of the heads of twoscrews M, so cut away as to form lugs fm, which project into and engagethe sides of a slot J, formed in the said shaft, as shown clearly in thedrawings. In order to allow the screws M to be putin place, the edges ofone end of the slot in the shaft J are scooped out or cnt away, as shownin section in Fig. 2, so as to receive the heads of the screws and allowthe same to be turned. After the screws have been secured in position inthe ring R the same is moved along the shaft, so that the lugs m of thescrews engage the sides of the c slot, and are thus prevented fromturning.

Movement is communicated to the ring R by means of a cross-bar L,sliding in the slot of the shaft J and having notched ends L engagingthe lugs m, as shown in Fig. 1. The cross-bar L is secured in anysuitable manner to one end of a rod K2, which slides in a hole J2,drilled concentric with the shaft J and extending into the same adistance slightly beyond the slot J2. A handle or knob K2 is swiveled tothe projecting end of the rod K2, so as to allow the rod to turn Withoutturning the knob.

When the entire starting resistance is in circuit, the brushes andcontacts have the relation shown in Fig. l. When it is desired to cutout the resistance, the rod K2 is pushed into the shaft a distancesufficient to cause the brushes Q to connect together the first set ofcontacts f2, thus cutting out approximately half of the resistance.Further movement of the rod K2 connects together the middle point of theremaining portion of each resistance, while a still further movement ofthe rod K2 cuts out the resistance entirely by connecting each of theblocks Il together, and thus connecting the leads I2 directly to eachother.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. In an alternating-current motor, the com* bination of a hollowrevolving member, a snpporting-frame secured to the interior of therevolving member, a resistance carried by said frame, arms projectingfrom said frame, contact-blocks carried by said arms and electricalconnections between said contactblocks and resistance.

2. In an alternatingcurrcnt motor-,the combination ofa hollow revolvingmember, a plurality of supportingframes independently secured to theinterior of the revolving member, resistances carried by said supportingframes, contact-blocks also carried .by said supporting-frames andlocated out of the planes of said resistances, and contactbrushescarried by a device sliding on the shaft of the motor and engaging saidcontactblocks.

In an alternating-current motel-,the combination of a hollow revolvingmember, aplnrality vof supporting-frames secured to the interior of saidmember, resistance grids mounted on said frames,arms projecting fromsaid frames toward the shaft on which said member is mounted, contactscarried by said arms and electrically connected to said grids, andbrushes for said contacts slidingly mounted on the shaft.

In testimony whereof I have hereunto set my hand this 22d day ofNovember, 1898.

HENRY G. REIS'I.

Witnesses:

B. B. HULL, A. H. ABELL.

